File : system-lynxos178-ppc-raven-cert.ads


   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --                               S Y S T E M                                --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                    (LynxOS-178 Ravenscar Version PPC)                    --
   9 --                                                                          --
  10 --          Copyright (C) 1992-2015, Free Software Foundation, Inc.         --
  11 --                                                                          --
  12 -- This specification is derived from the Ada Reference Manual for use with --
  13 -- GNAT. The copyright notice above, and the license provisions that follow --
  14 -- apply solely to the  contents of the part following the private keyword. --
  15 --                                                                          --
  16 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  17 -- terms of the  GNU General Public License as published  by the Free Soft- --
  18 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  19 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  20 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  21 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  22 --                                                                          --
  23 --                                                                          --
  24 --                                                                          --
  25 --                                                                          --
  26 --                                                                          --
  27 -- You should have received a copy of the GNU General Public License and    --
  28 -- a copy of the GCC Runtime Library Exception along with this program;     --
  29 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  30 -- <http://www.gnu.org/licenses/>.                                          --
  31 --                                                                          --
  32 -- GNAT was originally developed  by the GNAT team at  New York University. --
  33 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  34 --                                                                          --
  35 ------------------------------------------------------------------------------
  36 
  37 --  Level A certifiable Ravenscar LynxOS-178 version
  38 
  39 pragma Restrictions (No_Finalization);
  40 --  Controlled types are not supported in this run time
  41 
  42 pragma Restrictions (No_Exception_Registration);
  43 --  Disable exception name registration. This capability is not used because
  44 --  it is only required by exception stream attributes which are not supported
  45 --  in this run time.
  46 
  47 pragma Restrictions (No_Implicit_Dynamic_Code);
  48 --  Pointers to nested subprograms are not allowed in this run time, in order
  49 --  to prevent the compiler from building "trampolines".
  50 
  51 pragma Restrictions (No_Use_Of_Pragma => Attach_Handler);
  52 pragma Restrictions (No_Specification_Of_Aspect => Attach_Handler);
  53 --  This pragma is not supported by the Ravenscar Cert profile
  54 
  55 pragma Profile (Ravenscar);
  56 
  57 package System is
  58    pragma Pure;
  59    --  Note that we take advantage of the implementation permission to make
  60    --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
  61    --  2005, this is Pure in any case (AI-362).
  62 
  63    pragma No_Elaboration_Code_All;
  64    --  Allow the use of that restriction in units that WITH this unit
  65 
  66    type Name is (SYSTEM_NAME_GNAT);
  67    System_Name : constant Name := SYSTEM_NAME_GNAT;
  68 
  69    --  System-Dependent Named Numbers
  70 
  71    Min_Int               : constant := Long_Long_Integer'First;
  72    Max_Int               : constant := Long_Long_Integer'Last;
  73 
  74    Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
  75    Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
  76 
  77    Max_Base_Digits       : constant := Long_Long_Float'Digits;
  78    Max_Digits            : constant := Long_Long_Float'Digits;
  79 
  80    Max_Mantissa          : constant := 63;
  81    Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
  82 
  83    Tick                  : constant := 1.0 / 60.0;
  84 
  85    --  Storage-related Declarations
  86 
  87    type Address is private;
  88    pragma Preelaborable_Initialization (Address);
  89    Null_Address : constant Address;
  90 
  91    Storage_Unit : constant := 8;
  92    Word_Size    : constant := 32;
  93    Memory_Size  : constant := 2 ** 32;
  94 
  95    --  Address comparison
  96 
  97    function "<"  (Left, Right : Address) return Boolean;
  98    function "<=" (Left, Right : Address) return Boolean;
  99    function ">"  (Left, Right : Address) return Boolean;
 100    function ">=" (Left, Right : Address) return Boolean;
 101    function "="  (Left, Right : Address) return Boolean;
 102 
 103    pragma Import (Intrinsic, "<");
 104    pragma Import (Intrinsic, "<=");
 105    pragma Import (Intrinsic, ">");
 106    pragma Import (Intrinsic, ">=");
 107    pragma Import (Intrinsic, "=");
 108 
 109    --  Other System-Dependent Declarations
 110 
 111    type Bit_Order is (High_Order_First, Low_Order_First);
 112    Default_Bit_Order : constant Bit_Order := High_Order_First;
 113    pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
 114 
 115    --  Priority-related Declarations (RM D.1)
 116 
 117    --  Ada priorities are mapped to VxWorks priorities using the following
 118    --  transformation: 255 - Ada Priority
 119 
 120    --  Ada priorities are used as follows:
 121 
 122    --  256        is reserved for the VxWorks kernel
 123    --  248 - 255  correspond to hardware interrupt levels 0 .. 7
 124    --  247        is a catchall default "interrupt" priority for signals,
 125    --             allowing higher priority than normal tasks, but lower than
 126    --             hardware priority levels.  Protected Object ceilings can
 127    --             override these values.
 128    --  246        is used by the Interrupt_Manager task
 129 
 130    Max_Priority           : constant Positive := 245;
 131    Max_Interrupt_Priority : constant Positive := 255;
 132 
 133    subtype Any_Priority       is Integer      range   0 .. 255;
 134    subtype Priority           is Any_Priority range   0 .. 245;
 135    subtype Interrupt_Priority is Any_Priority range 246 .. 255;
 136 
 137    Default_Priority : constant Priority := 122;
 138 
 139 private
 140 
 141    type Address is mod Memory_Size;
 142    Null_Address : constant Address := 0;
 143 
 144    --------------------------------------
 145    -- System Implementation Parameters --
 146    --------------------------------------
 147 
 148    --  These parameters provide information about the target that is used
 149    --  by the compiler. They are in the private part of System, where they
 150    --  can be accessed using the special circuitry in the Targparm unit
 151    --  whose source should be consulted for more detailed descriptions
 152    --  of the individual switch values.
 153 
 154    Backend_Divide_Checks     : constant Boolean := False;
 155    Backend_Overflow_Checks   : constant Boolean := True;
 156    Command_Line_Args         : constant Boolean := True;
 157    Configurable_Run_Time     : constant Boolean := True;
 158    Denorm                    : constant Boolean := True;
 159    Duration_32_Bits          : constant Boolean := False;
 160    Exit_Status_Supported     : constant Boolean := True;
 161    Fractional_Fixed_Ops      : constant Boolean := False;
 162    Frontend_Layout           : constant Boolean := False;
 163    Machine_Overflows         : constant Boolean := False;
 164    Machine_Rounds            : constant Boolean := True;
 165    Preallocated_Stacks       : constant Boolean := False;
 166    Signed_Zeros              : constant Boolean := True;
 167    Stack_Check_Default       : constant Boolean := False;
 168    Stack_Check_Probes        : constant Boolean := True;
 169    Stack_Check_Limits        : constant Boolean := False;
 170    Support_Aggregates        : constant Boolean := True;
 171    Support_Composite_Assign  : constant Boolean := True;
 172    Support_Composite_Compare : constant Boolean := True;
 173    Support_Long_Shifts       : constant Boolean := True;
 174    Always_Compatible_Rep     : constant Boolean := True;
 175    Suppress_Standard_Library : constant Boolean := False;
 176    Use_Ada_Main_Program_Name : constant Boolean := False;
 177    Frontend_Exceptions       : constant Boolean := True;
 178    ZCX_By_Default            : constant Boolean := False;
 179 
 180 end System;